Granted Patent
Utility
US 4,853,437 · App. 07/164,165
Water- and caustic-insoluble, inswellable, fibrous, particulate crosslinked polymer
Inventors:
Carl A. Lukach, Arjun C. Sau
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Mar 4, 1988
Inventors
Carl A. Lukach
Arjun C. Sau
Assignee (at issue)
HERCULES LLC
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.